This is the format of the queryhit trailer:
bytes what
-----------------------------------------------------------------
0 - 3 Vendor code
4 Open data section size (integer)
5 - 6 Open data section
7 - N Private data section
In the example, "open data size" = 2; open data = "0x1C01"; private data is "0x1800...0C00".
The open data is described in the 0.4 protocol pdf and in the source of open-source clients.
Bearshare's private data is described in
http://groups.yahoo.com/group/the_gdf/message/5845